Which liquids to use

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Adam Kramer 1A
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Joined: Sat Aug 24, 2019 12:15 am

Which liquids to use

Postby Adam Kramer 1A » Mon Jan 13, 2020 1:14 am

Dr. Lavelle earlier mentioned that we never use liquids or solids in calculating the K or Q values, but in the last lecture I remember him mentioning a few times that we would use the concentration of the liquid or something like that... Can someone explain why he was saying that we find that liquid concentration now?

Ashley Fang 2G
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Joined: Fri Aug 30, 2019 12:17 am

Re: Which liquids to use

Postby Ashley Fang 2G » Mon Jan 13, 2020 10:03 am

We never use pure solids (s) or liquids (l) in calculating equilibrium, but we do use gaseous (g) and aqueous (aq) substances. Maybe he was referring to the liquid concentration in the aqueous substance.

Marni Kahn 1A
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Re: Which liquids to use

Postby Marni Kahn 1A » Mon Jan 13, 2020 10:09 am

I think that you were getting confused with aqueous solutions, which are included in K calculations

Sam McNeill 1E
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Re: Which liquids to use

Postby Sam McNeill 1E » Mon Jan 13, 2020 10:38 am

Pure liquids are never used, since there cannot be a concentration of a pure liquid.

Ashley Tran 2I
Posts: 108
Joined: Thu Jul 11, 2019 12:17 am

Re: Which liquids to use

Postby Ashley Tran 2I » Mon Jan 13, 2020 11:18 am

To add on, we don't include a pure liquid in an equilibrium calculation because it acts as the solvent in a chemical reaction and its change in concentration is relatively insignificant so in the K expression, the product concentration and reactant concentration would just cancel out.

Abigail_Hagen2G
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Joined: Fri Aug 09, 2019 12:17 am

Re: Which liquids to use

Postby Abigail_Hagen2G » Tue Jan 14, 2020 2:21 pm

For solving equilibrium constants, you usually just use aqueous compounds or gaseous ones

Minh Ngo 4G
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Joined: Thu Jul 25, 2019 12:17 am

Re: Which liquids to use

Postby Minh Ngo 4G » Tue Jan 14, 2020 2:33 pm

Only use aqueous and gas for K. You probably misunderstood aqueous for liquid.

nicole-2B
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Joined: Fri Aug 30, 2019 12:18 am

Re: Which liquids to use

Postby nicole-2B » Wed Jan 15, 2020 9:44 am

Ashley Tran 2I wrote:To add on, we don't include a pure liquid in an equilibrium calculation because it acts as the solvent in a chemical reaction and its change in concentration is relatively insignificant so in the K expression, the product concentration and reactant concentration would just cancel out.

Thanks for explaining the reason why!!


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